利用耕地压力指数模型，计算分析了2010年西北旱区大型灌区不同粮食消费模式下的耕地压力指数、粮食盈余情况及可再承载人口状况。结果表明：在平衡膳食（PH）、初步小康或营养安全（XK）、富裕型（FY）社会三种不同粮食消费模式下，西北旱区97所大型灌区的耕地压力虽差异明显，但整体压力较小，三种模式的平均耕地压力指数（K值）均小于1，人粮关系较为和谐，除保证自身粮食需求外仍有一定的粮食盈余；三种模式下，粮食盈余量为869．19、586．18、41．46万t ，可再承载人口数为2698．75、1465．46、75．38万人。%Based on the arable pressure index (API) model ,the APIs of large-scale irrigation areas in arid regions of northwest China were calculated ,and the conditions of food supplies and re-carrying population were analyzed under different food consumption patterns .The results showed that the overall APIs were still low ,average arable pressure in-dexes (K values) of three patterns were less than or equal to 1 ,and the relationship between population and food produc-tion was relatively harmonious ,although there were obvious differences in APIs of 97 irrigations under different food con-sumption patterns .In addition to supplying food for self-consumptions ,there was still respectable amount of surplus food , which was 869 .19 ,586 .18 and 41 .46 ten thousand tons , respectively , under the economic society of balanced diet (PH) ,a comfortable level of living (XK) ,and relatively comfortable society (FY) .The re-carrying populations were 2698 .75 ,1465 .46 ,and 75 .38 ten thousand people ,respectively .The results could be used to provide data and theo-retical bases for assessing the status of arable land resources in the northwest arid areas .
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